Snow plow



mzams L. T. ROSS SNOW PLOW Feb. 4,, 1936.

Filed Dec. 26, 1934 2 Sheets-Sheet l v INVENTOR 55751? 71' Ross.

ATTORNEYS L. T. ROSS SNOW PLOW Filed D90. 25, 1934 2 Sheets-Sheet 2 INVENTOR ATTORNEYS Patented Feb. 4, 1936 PATENT OFFICE SNOW PLOW! Lester T. Ross, Crestline, Ohio, assignor to The i Burch Corporation, Crestline, Ohio, a corporation Application December 26, 1934, Serial No. 759.266

Claims.

The present invention has to do with snow plows of the type which take the form of attachment devices applicable to tractors or automotive trucks, and the invention embodies improvements 5 in the construction of such plows set forth in my previous Letters Patent No. 1,882,945, issued October 18, 1932.

Generally speaking, snow plows such as are intended to embody the improvements hereof comprise supporting means for the plow device includingpush bars which are detachably anchored to the rear axle of the vehicle intended to move the plow forwardly to its work. The push bars extend forwardly from the rear axle of the vehicle in advance of the front axle and the plow means carried at the front end of the push bars includes suitable scraping blade features and a moldboard. The moldboard is carried for suitable vertical adjustment at the front end of the push bars, and suitable bracing means is preferably employed intermediate the moldboard and one of the push bars.

The principal improvement in my present construction as compared with those heretofore developed by me, of which the patented construction aforesaid is an example, lies in the provision of cushioning devices which form parts of the push bars and enable the said push bars to yield, whereby the shocks of forcing the plow against its work when considerable resistance is met with are absorbed through the action of said cushion means. The cushioning devices utilized by me are in the form of cushioning units embodied in the push bar structures and also in the form of a cushioning unit in the brace structure intermediate the moldboard and one of the push bars.

Still another feature of my invention lies in the provision of a novel type of scraper especially useful in permitting the plow to climb over obstacles in the path of the movement thereof as when being operated along a pavement in which may be located at intervals manholes or thelike which slightly protrude upwardly from the surface of the pavement and which, if engaged by an upwardly inclining scraper blade, might cause the breakage of the blade or the breakage of some of the supporting parts of the frame, push bar, and brace devices.

In the accompanying drawings preferred constructions of the provisions above referred to are illustrated, and referring to the drawings,-

Figure 1 is a somewhat diagrammatic top .plan view showing a truck chassis partially illustrated and the disposition of my plow and supporting parts relative thereto, the arrangement of the cushion features being primarily intended to be brought out.

Figure 2 is a vertical longitudinal sectional view through the rear end of one of the push bars, showing the cushion or' shock absorber incorporated in its construction.

Figure 3 is a side elevation of the parts which are shown in Figure 2.

Figure 4 is a side view of the brace unit intermediate the moldboard and one of the push bars, bringing out the disposition of the cushion or shock absorber feature of said brace bar.

Figure 5 is a vertical longitudinal sectional view of the brace illustrated in Figure 4.

Figure 6 is a fragmentary side view and partly sectional view showing the method of anchoring the rear end of one of the push bars to the rear axle of the truck, tractor, or whatever the pushing vehicle may be.

Figure 7 is a fragmentary side view bringing out more clearly the manner in which the push bar is adapted to movably shift in reference to the front spring and axle construction in order that the shock absorber or cushion devices may function to permit rearward yielding of the snow plow and the parts which support it upon the truck.

Figure 8 is a vertical sectional view taken about on the line 8-8 of Figure '7.

Figure 9 is a perspective view of the moldboard showing clearly the arrangement of the parts of the scraper blade and attachment means therefor.

Figure 10 is a sectional view taken about on the line l0l0 of Figure 9.

Figure 11 is an enlarged section about on the line ll--ll of Figure 9.

Figure 12 is a sectional View illustrating a manhole cover of a pavement and the manner in which the scraper blade would advance toward the same and readily become elevated by engagement therewith so as to freely pass thereover.

'I refer first to Figure 1 wherein is shown a rear axle l equipped with the usual ground wheels 2 of suitable number, and there is also shown the front axle 3 and front wheels 4, these parts being the customary parts of a truck or tractor and being somewhat diagrammatically shown in connection with the truck frame or chassis 5 which is partly broken away to more fully illustrate the push bars 6 that carry at their front ends the snow plow generally designated at A. The plow may be supported in any suitable way upon the push bars 6 at their front end, as by the employment of a supporting frame I of some kind. These various parts are not material tothe invention except in so far as the push bars are of the special design now to be set forth and in so far as the plow embodies the special type of blade that will be later described.

The rear ends of the push bars 6, which are of identical construction, are anchored to the rear axle I in any suitable Way, as by means of clamp parts 8 and 9 and attachment and take-up cable means ID. The said attachment and clamp means engage, with respect toeach bar, a hook section I I at the rear extremity of the same. The said rear end section II of each push bar 6 has a tubular forward extension H a that is received telescopically and in a snug fitting manner in the hollow rear main portion of the bar 6, the intention being that the main bar 6 and its coacting rear end section II and Ila shall be relatively slidable. Normally the section Hl Ia. of the push bar 6 is extended in reference to the main portion of the push bar by means of a cushioning or shock absorbing spring I2 which at its rear end bears against a shoulder [3 of a sleeve or bushing 14 surrounding the rear portion of the bar 6 near the hook section H thereof and directly surrounding the extension member Ila of said section H.

A pin l5 passes through the sleeve l4 and through openings in the extension Ila, of the part I I. This pin also operates in a slot [6 in the rear end of the main body of the push bar 6. Surrounding the push bar 6 and at the front end of the spring [2 is an abutment collar or sleeve ll rigidly fixed to the member 6. It is evident that when undue stresses or strains are placed upon the push bar 6 in a rearward direction the bar is adapted to slide rearwardly upon the extension la of the rear end section I I of said bar and in this manner the spring l2 will act as a shock absorber for absorbing the shocks that may occur from time to time when undue resistances are met during the forward pushing of the plow A against snow or other material intended to be moved thereby.

Now in order that the push bars 6 may shift rearwardly while sliding relatively to their rear end sections I|-Ha, it is necessary that some sliding or movable connection be established between the front axle and spring means and said push bars 6. For this purpose each push bar is adapted to slide in a yoke l8 that is supported by the front axle. The yoke I8 is secured to the front axle l9 by means of clamping portions [9 and bolts 23, as obvious from Figure 7. The yoke l8 really comprises spaced suspension members at the lower ends of which is carried a yoke plate 20 curved to conform to the round tubular shape of the adjacent push bar. The parts l8 and 20 are united by headed pins 2| secured in place by cotterpins 22, but any suitable equivalent means may be employed, such as bolts with nuts, or the like.

In Figures 1, 4 and 5 there is illustrated intermediate the rear end of the snow plow A and one of the push bars 6 a brace 3|. This brace comprises a front section 3| a and a rear section 3Ib. The front section slides telescopically in the rear section as seen in Figure 5, and a pin or bolt 32 passes through both sections for securing them, while slot 33 permits relative movement between these sections. The front end of the section 31b has a shoulder 34 against which may bear the cushion spring 35, the front end of which engages with a. ring welded to the section Na and also forming a shoulder 36. By reason of the inter position of the spring between the sections 3 la and 3H) the brace has yielding functions providing a cushioning feature between the plow and the push bar 6 to which the brace is connected. Reference to my previous patent will show the general construction of the snow plow which is retained as a part of this invention and which includes the moldboard 24 and the push plate 25 of known construction. In lieu of the type of scraper blade with the forwardly presented edge which I have heretofore employed, I propose to use a blade 26 which is carried by an angle plate 21 having the depending portion 28 provided with apertures through which bolts fastening the blade 26 thereto may be passed. The angle plate 21 rests upon the attachment plate 29 and bolts pass through the forward portion of the push plate 25, the attachment plate 29, and the angle plate 21 for fastening these parts in a manner self-evident upon reference to Figures 10 and 11. The angle plate 21 in its working position inclines downwardly and its flange or part 28 inclines somewhat at an angle to the vertical, as shown clearly in Figure 12, so that under these conditions the blade 26 which is carried by the flange or member 28 is similarly presented at a tilt or forwardly and upwardly extending angle from the surface or pavement over which the snow plow will be moved by the push bars 6.

The above construction is desirable for the reason illustrated by Figure 12, since as the plow A is moved forwardly the blade 26 will effectively perform its scraping function, but if it strikes an obstacle, such as the manhole cover 30 that may slightly protrude upwardly from the surface of the pavement, the blade will ride upwardly over said cover by automatic raising action, avoiding likelihood of breakage of the parts in a self-evident manner.

The manner of attachment of the blade 26 permits it to be reversed so that its lower edge will be disposed upwardly after becoming more or less Worn, and a fresh upper edge located in the downward effective working position. If desired, the attachment plate 29 may be made in sections whilst the angle plate 21 may be a single plate or member, or sectional also, though it is illustrated as in one piece. Preferably the blade 26 will be in the form of a high carbon wearing strip and it is made in two pieces, both of which are reversible for wear, in the manner hereinbefore set forth.

By the employment of the construction just set forth with the safety shock absorbing springs l2 for the push bars and the type and arrangement of scraping blade utilized, the snow plow A of this invention may be as safely employed for city plowing as what are known in the art as trip blades especially designed for such work, and it will be seen that the advantages of the moldboard type of blade plow, especially useful for deep snow removal, are retained.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is-

1. In a snow plow or the like, push bars adapted to be mounted upon a vehicle, said push bars including a rear section adapted to be anchored to the vehicle, a forward section telescopically receiving the rear section so as to permit relative movement therebetween, a sleeve having a forwardly presented abutment face slidably mounted on the forward section, said forward section having a slot therein, a pin extending through said sleeve, slot and rear section, thereby fixing said sleeve to said rear section but permitting relative movement between the sleeve and the forward section, said forward section being further provided with a fixed rearwardly presented abutment face spaced from the first mentioned abutment face, a spring encircling said forward section intermediate said abutment faces and acting upon said faces to normally maintain said forward section forwardly extended while acting as a shock absorber on relative rearward movement of the section, means for suspending the front ends of the push bars from the vehicle while permitting relative longitudinal movement of the same with respect to the vehicle incident to telescopic movement of the push bar sections, and means at the front end of the push bars for supporting a plow blade.

2. In a snow plow or the like, push bars adapted to be mounted upon a vehicle, said push bars including a rear section adapted to be anchored to the vehicle, a forward section telescopically receiving the rear section so as to permit relative movement therebetween, spring means interposed between said sections for yieldably restraining such telescopic movement, means for suspending the front ends of the push bars from the vehicle while permitting relative longitudinal movement of the same with respect to the vehicle incident to telescopic movement of the push bar sections, means at the front end of the push bars for supporting a plow blade, and bracing means interposed between one end of the plow blade and one of the push bars and including a forward section pivotally connected with the plow bladeand a rear section pivotally connected with the forward section of the push bar and telescopically receiving the forward brace section, and spring means interposed between the brace sections for yieldably restraining telescopic movement between the same.

3. In a snow plow or the like, push bars adapted to be mounted upon a vehicle, said push bars including a rear section adapted to be anchored to the vehicle, a forward section telescopically receiving the rear section so as to permit relative movement therebetween, spring means interposed between said sections for yieldably restraining such telescopic movement, means for suspending the-front ends of the push bars from the vehicle while permitting relative longitudinal movement of the same with respect to the vehicle incident to telescopic movement of the push bar sections, means at the front end of the push bars for supporting a plow blade, and bracing means interposed between one end of the plow blade posed between said last mentioned flanges to normally maintain said forward brace section forwardly extended, while acting as a shock absorber on relative rearward movement of said forward brace section.

4. In a snow plow or the like, push bars adapted to be mounted upon a vehicle, said push bars including a rear section adapted to be anchored to the vehicle, a forward section telescopically receiving the rear section so as to permit relative movement therebetween, spring means interposed between said sections for yieldably restraining such telescopic movement, means for suspending the front ends of the push bars from the vehicle while permitting relative longitudinal movement of the same with respect to the vehicle incident to telescopic movement of the push bar sections, said last mentioned means comprising a suspension yoke including laterally spaced clamping parts for clamping onto a suitable part beneath the forward end of the vehicle, and a push rod seat connected to the lower extremity of each of the laterally spaced clamping parts and extending transversely therebetween so as to form a saddle on which the push bar is adapted to rest, and means at the front end of the push bars for supporting a plow blade.

5. In a snow plow or the like, push bars adapted to be mounted upon a vehicle, said push bars including a rear section adapted to be anchored to the vehicle, a forward section telescopically receiving the rear section so as to permit relative movement therebetween, shock absorbing means incorporated in the push bars for permitting yielding telescopic action of the same when the snow plow is in operation, means at the front end of the push bars for supporting a plow blade, and a telescopic brace bar intermediate said plow blade and one of the push bars and having shock absorbing means incorporated therein for yieldably resisting rearwardly directed thrusts imparted to the blade at one side of a median line.

LESTER T. ROSS. 

